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Abstract

The paper deals with the problem of force and torque calculation for linear, cylindrical and spherical electromechanical converter.

The electromagnetic field is determined analytically with the help of separation method for each problem. The results obtained can be used as test tasks for electromagnetic field, force and torque numerical calculations. The analytical relations for torque and forces are also convenient for analysis of material parameters influence on electromechanical converter work.

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Authors and Affiliations

D. Spałek
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Abstract

A dynamic weighing system or a checkweigher is an automated inspection system that measures the weight of objects while transferring them between processes. In our previous study, we developed a new electromagnetic force compensation (EMFC) weighing cell using magnetic springs and air bearings. This weighing cell is free from flexure hinges which are vulnerable to shock and fatigue and also eliminates the resonance characteristics and implements a very low stiffness of only a few N/m due to the nature of the Halbach array magnetic spring. In this study, we implemented a checkweigher with the weighing cell including a loading and unloading conveyor to evaluate its dynamic weighing performances. The magnetic springs are optimized and re-designed to compensate for the weight of a weighing conveyor on the weighing cell. The checkweigher has a weighing repeatability of 23 mg (1σ) in static situation. Since there is no lowfrequency resonance in our checkweigher that influences the dynamic weighing signal, we could measure the weight by using only a notch filter at high conveyor speeds. To determine the effective measurement time, a dynamic weighing process model is used. Finally, the proposed checkweigher meets Class XIII of OIML R51-1 of verification scale e 0.5 g at a conveyor speed of up to 2.7 m/s.
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Bibliography

[1] Schwartz, R. (2000). Automatic weighing-principles, applications and developments. Proceedings of XVI IMEKO, Austria, 259–267.
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[5] Yamakawa, Y., & Yamazaki, T. (2010). Dynamic behaviors of a checkweigher with electromagnetic force compensation (2nd report). Proceedings of the XIX IMEKO, Portugal. https://www.imeko.org/publications/tc3-2010/IMEKO-TC3-2010-001.pdf.
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[7] Yamakawa, Y., & Yamazaki, T. (2015). Modeling and control for checkweigher on floor vibration. Proceedings of the XXI IMEKO, Czech Republic. https://www.imeko.org/IMEKO-WC-2015- TC3-093.pdf.
[8] Yamazaki, T., Sakurai, Y., Ohnishi, H., Kobayashi, M., & Kurosu, S. (2002). Continuous mass measurement in checkweighers and conveyor belt scales. Proceedings of the SICE Annual Conference, 470–474. https://doi.org/10.1109/SICE.2002.1195446.
[9] Sun, B., Teng, Z., Hu, Q., Lin, H., & Tang, S. (2020). Periodic noise rejection of checkweigher based on digital multiple notch filter. IEEE Sensors Journal, 20(13), 7226–7234. https://doi.org/10.1109/JSEN.2020.2978232.
[10] Piskorowski, J., & Barcinski, T. (2008). Dynamic compensation of load cell response: A timevarying approach. Mechanical Systems and Signal Processing, 22(7), 1694–1704. https://doi.org/10.1016/j.ymssp.2008.01.001.
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[12] Umemoto, T., Sasamoto, Y., Adachi, M., Kagawa, Y. (2008). Improvement of accuracy for continuous mass measurement in checkweighers with an adaptive notch filter. Proceedings of the SICE Annual Conference, 1031–1035. https://doi.org/10.1109/SICE.2008.4654807.
[13] Boschetti, G., Caracciolo, R., Richiedei, D., & Trevisani, A. (2013). Model-based dynamic compensation of load cell response in weighing machines affected by environmental vibrations. Mechanical Systems and Signal Processing, 34(1–2), 116–130. https://doi.org/10.1016/j.ymssp.2012.07.010.
[14] Sun, B., Teng, Z., Hu, Q., Tang, S., Qiu, W., & Lin, H. (2020). A novel LMS-based SANC for conveyor belt-type checkweigher. IEEE Transactions on Instrumentation and Measurement, 70, 1– 10. https://doi.org/10.1109/TIM.2020.3019618.
[15] Niedzwiecki, M., Meller, M., & Pietrzak, P. (2016). System identification -based approach to dynamic weighing revisited. Mechanical Systems and Signal Processing, 80, 582–599. https://doi.org/10.1016/j.ymssp.2016.04.007.
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Authors and Affiliations

Hyun-Ho Lee
1
Kyung-Taek Yoon
1
Young-Man Choi
1

  1. Ajou University, Department of Mechanical Engineering, 206, World cup-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Republic of Korea, Suwon, Republic of Korea
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Abstract

Electromagnetic forces generated by the short circuit current and leakage flux in low- and high-voltage windings of distribution transformers as well as amorphous core transformers will cause the translation, destruction, and explosion of the windings. Thus, the investigation of these forces plays a significant role for researchers and manufacturers. Many authors have recently used the finite element method to analyze electromagnetic forces. In this paper, an analytic model is first developed for magnetic vector potential formulations to compute the electromagnetic forces (i.e., axial and radial forces) acting on the low- and high-voltage windings of an amorphous core transformer. The finite element technique is then presented to validate the results obtained from the analytical model. The developed model is applied to an actual problem.
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Authors and Affiliations

Bao Doan Thanh
1
ORCID: ORCID
Doan Duc Tung
1
ORCID: ORCID
Tuan-Ho Le
1
ORCID: ORCID

  1. Faculty of Engineering and Technology, Quy Nhon University, Binh Dinh province, Vietnam

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